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A 4 cm "Karlsbad twin" of sanidite in trachyte matrix from Ölberg, Siebengebirge, Rhineland - not far from the sanidite type locality Drachenfels. (Author: Andreas Gerstenberg)

A 4 cm "Karlsbad twin" of sanidite in trachyte matrix from Ölberg, Siebengebirge, Rhineland - not far from the sanidite type locality Drachenfels. (Author: Andreas Gerstenberg)

Dimensions: 600 x 451
File size: 32.02 kbytes
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